JPH05296821A - Weight inspection device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a weight inspection device which does not need to input the reference value itself and can inspect based on the reference value corresponding to the weight change of the product itself. [Structure] The weight measurement value of the first object to be measured is registered as a reference value, the second and subsequent inspections are performed based on this reference value, and after multiple measurements, the average value of these is updated as the reference value. , The inspection is performed while repeating this data update.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weight inspection device for controlling the number of products by a weight inspection.

[0002]

2. Description of the Related Art For example, in an automatic cartoning machine, when a plurality of products are cartoned, a weight inspection device is used to check whether a predetermined number of products are cartoned in a carton pack.

In such a weight inspection apparatus, a standard value, an upper limit value (for example +10 grams) and a lower limit value (for example -10 grams) are set, and a box packing pack which is an object to be measured falls within a prescribed range based on these reference values. It is determined whether the weight measurement value of 2 is entered, and if it is out of the specified range, the box pack is discharged as a defective product. Then, conventionally, the operator inputs the reference value according to the type of the box-filled pack.

[0004]

However, it is necessary to input the reference value every time the power of the weight inspection apparatus is turned on, or to input the reference value each time the type of the box-filled pack is changed. Also, since the reference value is a predetermined numerical value (absolute value), a certain number of non-defective products packed in a product are rejected due to changes in the weight of the product itself due to temperature and humidity, changes in the load cell itself of the weight inspection device, and so on. In some cases, it may be determined as a good product, or vice versa, a defective product may be determined as a good product.

Therefore, it is an object of the present invention to provide a weight inspection device which does not need to input the reference value itself and can inspect based on the reference value corresponding to the change in weight of the product itself over time. And

[0006]

A weight inspection apparatus according to the present invention for achieving the above object includes a load cell for measuring the weight of an object to be measured, a memory for storing the measured value of the load cell, and a memory for storing the measured value in the memory. Average value calculating means for calculating the average value of the stored plural measured values, reference value registering means for registering the reference value, and determining whether or not the measured value of the load cell falls within a specified range based on the reference value. A determination means is provided, and the first measured value of the measured object is registered as a reference value in the reference value registration means, and each time the average value calculation means calculates an average value, the average value is updated as the reference value. It was controlled to do so.

[0007]

[Function] Since the subsequent measurement is performed using the first measured value of the measured object as the reference value, and the average value of the measured values is updated as the reference value for each measurement, the reference value is changed over time. It changes to a value that corresponds to various weight changes.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention.

FIG. 2 is a schematic perspective view of the weight inspection device, and FIG. 3 is a circuit block diagram thereof. 2 and 3, three belt conveyors 2a, 2b, 2c are provided on the upper surface of the apparatus main body 1, and each belt conveyor 2a, 2b, 2c is driven by the belt conveyor drive unit 3. A box filling machine (not shown) is installed on the upstream side of the belt conveyors 2a, 2b, 2c. Transported by. In the box filling machine, for example, 10 tape cassettes are placed in a box.

The load cell 5 is the central belt conveyor 2b.
Is set as a measurement position, and the measured value is output to the CPU 6. The optical sensor 7 includes a light emitting portion 7a and a light receiving portion 7b, and a detection position is a boundary position between the upstream belt conveyor 2a and the central belt conveyor 2b. When the carton pack 4 is conveyed to this detection position, the optical sensor 7 detects this and the CPU
Output to 6.

The discharging means 8 has a pair of discharging arms 8a on both sides of the downstream belt conveyor 2c.
For example, a is displaced to a position indicated by an imaginary line in FIG. 2 to remove the box packing pack 4. The drive of the discharging means 8 is controlled by the CPU 6.

The input unit 9 has a power switch, a mode setting switch, a numeric keypad, etc., and inputs the mode setting, the upper limit value, and the like. This input data is output to the CPU 6. The display unit 10 displays the reference value, the upper limit value, and the lower limit value, and the display contents are controlled by the CPU 6. The CPU 6 also controls on / off of the buzzer 11 and stop of the peripheral equipment 12.

The CPU 6 controls each unit as described above and has a memory, a number counter, an NG counter, an average value calculating means, a reference value registering means and a discriminating means. The memory stores the measured value of the load cell 5, the upper limit value and the lower limit value. The average value calculation means calculates an average value of a plurality of measurement values (for example, 10 times) stored in the memory. The reference value registration means registers the reference value. The discriminating means determines whether or not the measured value of the load cell 5 falls within a specified range based on the reference value, that is, within a range between a value obtained by adding the upper limit value to the reference value and a value obtained by subtracting the lower limit value from the reference value. Determine whether. Then, the CPU 6 executes the flow shown in FIG. 4 in the initial setting mode and the flow shown in FIG. 1 in the normal operation mode.

The operation of the above configuration will be described below. The initial setting mode is selected by the input unit 9. Then, the upper limit value is input using the ten keys of the input unit 9. Then, this upper limit value is stored in the memory in the CPU 6. Next, the lower limit value is input using the ten keys of the input unit 9 as well. Then, the lower limit value is stored in the memory in the CPU 6, and the initial setting is completed.

The normal operation mode is selected by the input section 9.
Then, the memory is cleared and the belt conveyor driving unit 3 and the like are driven, and the belt conveyors 2a, 2b, 2c
Box packing pack 4 is transported. Box containing pack 4
The optical sensor 7 detects this when the position reaches the position where the belt conveyor 2a on the upstream side moves to the belt conveyor 2b on the center. Then, the load cell 5 measures the weight when the carton pack 4 passes the detection position of the optical sensor 7, that is, when it moves to the central belt conveyor 2b, and the CPU 6
Registers this measured value as a reference value.

The second box-by-pack 4 is conveyed and the weight of the box-by-pack 4 is measured based on the detection by the optical sensor 7. If this weight is within the specified range based on the reference value, it is determined as a good product. Then, the measured value is stored in the memory, the count value of the frequency counter is incremented by 1, and the NG counter is cleared. When 10 packs 4 each of which has been determined to be a non-defective product have passed, an average value of the measured values of the packs 4 of the same that have been determined to be non-defective products is calculated, and the average value is used as a reference value to change the data. Then, the subsequent determination of the box-packing pack 4 is performed using the updated reference value. That is,
Normally, the standard value is updated every time 10 box-packs 4 are measured. Therefore, the weight of the box-packs 4 may change due to changes in the weight of the product itself due to temperature, humidity, etc. and changes over time in the load cell 5 itself. Is also updated to the reference value corresponding to it.

If the carton pack 4 is out of the specified range, it is determined to be a defective product. Then, the CPU 6 outputs a drive signal to the carry-out means 8, the discharge arm 8a is displaced to the position of the phantom line in FIG. 2, and the box pack 4 is removed from the normal route. Then, the count value of the NG counter is incremented by 1 without storing the measured value in the memory.

When the product is determined to be defective twice in succession, C
The PU 6 sounds the buzzer 11 and stops driving the peripheral equipment 12. The operator notices the trouble by the alarm of the buzzer 11, investigates the cause of the trouble, eliminates the cause of the trouble, and restarts the operation.

[0019]

As described above, according to the present invention, the weight for measuring the weight of the object to be measured, determining whether or not the measured value is within the specified range based on the reference value, and inspecting the non-defective / defective product. In the inspection device, register the first measured value as a reference value, and
Since it is configured to perform the inspection after the first time and update the data using these average values as the reference value after multiple measurements, and perform the inspection while repeating this data update, it is not necessary to input the reference value itself. Moreover, there is an effect that a proper value can be inspected by the reference value corresponding to the weight change of the product itself, the measurement change of the load cell itself, and the like.

[Brief description of drawings]

FIG. 1 is a flowchart of a normal operation mode (embodiment).

FIG. 2 is a schematic perspective view of a weight inspection device (example).

FIG. 3 is a circuit block diagram of a weight inspection device (embodiment).

FIG. 4 is a flowchart of an initial setting mode (embodiment).

[Explanation of symbols]

4 ... Box pack (measurement object) 5 ... Load cell 6 ... CPU (memory, average value calculating means, reference value registering means, discriminating means)

Claims (1)

[Claims] 1. A load cell for measuring the weight of an object to be measured, a memory for storing the measured value of the load cell, an average value calculating means for calculating an average value of a plurality of measured values stored in the memory, and a reference value. A reference value registration means for registering, and a determination means for determining whether or not the measured value of the load cell falls within a specified range based on this reference value, and the reference value is the measured value of the first measured object. A weight inspection apparatus characterized in that the weight inspection device is controlled to update the data by registering the value in the value registration means and each time the average value calculation means calculates the average value, the average value is used as the reference value.